【作者】 李永玲；

【导师】 林其钊；

【作者基本信息】 中国科学技术大学 ， 工程热物理， 2010， 硕士

【摘要】 能源是人类社会生存、经济发展以及提高人民生活水平的物质基础,是关系到国民经济命脉和国防安全的重要物质保障。我国能源消费结构仍属以煤炭为主的低质型能源消费结构,给我国带来严重的环境污染和能源危机问题,必须发展清洁能源,我国可利用的天然气资源量正在不断增加,天然气制氢将成为未来氢燃料的重要来源之一,多孔介质内的甲烷超绝热燃烧制氢属于甲烷自热重整制氢技术范畴,但由与传统的甲烷自热重整制氢技术有很大的不同,是一种新型的制氢方法国。国外学者对多孔介质内的超绝热燃烧开展了大量实验和理论研究工作,国内的研究者在双层、往复式及渐变型多孔介质燃烧器内的预混燃烧方面也开展了一定的实验和模拟研究,并取得了卓有成效的进展。为了解甲烷在内置多孔介质卷式反应器内超绝热富燃制氢特性,采用计算流体力学与详细的化学反应机理GRI1.2相结合的方法,对甲烷在该反应器的富燃制氢过程进行了数值模拟,研究当量比和预混气体流速对燃烧区峰值温度、合成气组分和甲烷转化效率的影响,并和试验值进行对比。结果表明,多孔介质内CH4的燃烧温度远超过其绝热燃烧温度,实现了超绝热条件下富燃制氢;在本文研究范围内,甲烷-氢气的转化效率随当量比和气体流速的增大而增大,数值模拟结果与试验值基本吻合。更多还原

【Abstract】 It is well known that hydrogen is a very efficient and clean-burning fuel. It contains much more energy per unit mass than any other conventional fuel and produces very low pollution emissions.Recently, hydrogen energy has become the focus of scientific research field. The conversion of methane to hydrogen has become the major source of the future hydrogen production, which is the major component of natural gas. Natural gas has become the third largest energy source. The method of producing hydrogen through rich combustion of methane in porous media can meet the above needs.To understand the working features of hydrogen production from methane super-adiabatic combustion in the built-in porous media Swiss-roll reactor, the computational fluid dynamics and detailed chemical reaction mechanism GRI1.2 were combined to simulate the reaction process of hydrogen production from methane in this reactor. The effects of equivalence ratio and premixed gas velocity on the highest temperature of burning zone, the components of synthesis gas and methane conversion efficiency were studied and compared with the experimental results. The results show that CH4 combustion temperature inside the porous media far outweigh the adiabatic combustion temperature, and the hydrogen production on the condition of superadiabatic combustion is realized. Within the scope of this research, methane-hydrogen conversion efficiency rises with the increase of equivalence ratio and premixed gas velocity, and the numerical values are similar with the experimental results.更多还原